Fastener base



FIG. 1 is a top plan view of a fastener base in accordance with my design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top, isometric perspective view thereof;

FIG. 5 is a bottom, isometric perspective view thereof; and,

FIG. 6 is a front elevational view of the fastener base, cut along the line “6-6” in FIG. 1 . 

CLAIM The ornamental design for a fastener base, as shown and described. 